From 9ed99927c2436eef20b66f360a790c77ed4223fb Mon Sep 17 00:00:00 2001
From: Florian Ermisch <florian.ermisch@mailbox.org>
Date: Fri, 25 Aug 2017 14:54:20 +0200
Subject: [PATCH] explain what the colon in mapping.j2 is for

---
 postfix/files/mapping.j2 | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/postfix/files/mapping.j2 b/postfix/files/mapping.j2
index a177bf4..348ab4d 100644
--- a/postfix/files/mapping.j2
+++ b/postfix/files/mapping.j2
@@ -1,5 +1,7 @@
 # Managed by config management
-
+{#- Some files (mainly the aliases one) require key and values
+    to be separated with a colon. For this `colon: True` should
+    be passed to the template #}
 {%- if colon is not defined %}
   {%- set colon = False %}
 {%- endif %}